108 lines
2.8 KiB
Markdown
108 lines
2.8 KiB
Markdown
# PyO3 [](https://travis-ci.org/PyO3/PyO3)
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[Rust](http://www.rust-lang.org/) bindings for the [python](https://www.python.org/) interpreter.
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* [Documentation](http://pyo3.github.io/PyO3/doc/PyO3/)
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* Cargo package: [pyo3](https://crates.io/crates/pyo3)
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---
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PyO3 is licensed under the [APACHE-2.0 license](http://opensource.org/licenses/APACHE-2.0).
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Python is licensed under the [Python License](https://docs.python.org/2/license.html).
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Supported Python versions:
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* Python 3.5 and up
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Supported Rust version:
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* Rust 1.17.0-nightly or later
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* On Windows, we require rustc 1.17.0-nightly
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## Usage
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To use `pyo3`, add this to your `Cargo.toml`:
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```toml
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[dependencies]
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pyo3 = "0.1"
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```
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Example program displaying the value of `sys.version`:
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```rust
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extern crate pyo3;
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use pyo3::{Python, PyDict, PyResult};
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fn main() {
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let gil = Python::acquire_gil();
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hello(gil.python()).unwrap();
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}
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fn hello(py: Python) -> PyResult<()> {
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let sys = py.import("sys")?;
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let version: String = sys.get("version")?.extract(py)?;
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let locals = PyDict::new(py);
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locals.set_item("os", py.import("os")?)?;
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let user: String = py.eval("os.getenv('USER') or os.getenv('USERNAME')", None, Some(&locals))?.extract(py)?;
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println!("Hello {}, I'm Python {}", user, version);
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Ok(())
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}
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```
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Example library with python bindings:
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The following two files will build with `cargo build`, and will generate a python-compatible library.
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On Mac OS, you will need to rename the output from \*.dylib to \*.so.
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On Windows, you will need to rename the output from \*.dll to \*.pyd.
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**`Cargo.toml`:**
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```toml
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[lib]
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name = "rust2py"
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crate-type = ["cdylib"]
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[dependencies.pyo3]
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version = "0.1"
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features = ["extension-module"]
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```
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**`src/lib.rs`**
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```rust
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#[macro_use] extern crate pyo3;
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use pyo3::{PyResult, Python};
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// add bindings to the generated python module
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// N.B: names: "librust2py" must be the name of the `.so` or `.pyd` file
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py_module_init!(librust2py, PyInit__librust2py, |py, m| {
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try!(m.add(py, "__doc__", "This module is implemented in Rust."));
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try!(m.add(py, "sum_as_string", py_fn!(py, sum_as_string_py(a: i64, b:i64))));
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Ok(())
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});
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// logic implemented as a normal rust function
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fn sum_as_string(a:i64, b:i64) -> String {
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format!("{}", a + b).to_string()
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}
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// pyo3 aware function. All of our python interface could be
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// declared in a separate module.
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// Note that the py_fn!() macro automatically converts the arguments from
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// Python objects to Rust values; and the Rust return value back into a Python object.
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fn sum_as_string_py(_: Python, a:i64, b:i64) -> PyResult<String> {
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let out = sum_as_string(a, b);
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Ok(out)
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}
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```
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For `setup.py` integration, see [setuptools-rust](https://github.com/PyO3/setuptools-rust)
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**This is fork of rust-cpython project https://github.com/dgrunwald/rust-cpython**
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